EP0862489A1 - Presse a filtres avec cognement sensible au poids des plaques de filtration - Google Patents

Presse a filtres avec cognement sensible au poids des plaques de filtration

Info

Publication number
EP0862489A1
EP0862489A1 EP96932266A EP96932266A EP0862489A1 EP 0862489 A1 EP0862489 A1 EP 0862489A1 EP 96932266 A EP96932266 A EP 96932266A EP 96932266 A EP96932266 A EP 96932266A EP 0862489 A1 EP0862489 A1 EP 0862489A1
Authority
EP
European Patent Office
Prior art keywords
filter
εaid
plate
head
cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96932266A
Other languages
German (de)
English (en)
Other versions
EP0862489A4 (fr
EP0862489B1 (fr
Inventor
David Mark Higgins
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Water Applications and Systems Corp
Original Assignee
United States Filter Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by United States Filter Corp filed Critical United States Filter Corp
Publication of EP0862489A1 publication Critical patent/EP0862489A1/fr
Publication of EP0862489A4 publication Critical patent/EP0862489A4/fr
Application granted granted Critical
Publication of EP0862489B1 publication Critical patent/EP0862489B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B01D25/34—Removal of the filter cakes by moving, e.g. rotating, the filter elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/003—Filters formed by clamping together several filtering elements or parts of such elements integrally combined with devices for controlling the filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/172—Plate spreading means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/32—Removal of the filter cakes
    • B01D25/34—Removal of the filter cakes by moving, e.g. rotating, the filter elements
    • B01D25/346—Removal of the filter cakes by moving, e.g. rotating, the filter elements by vibration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/54—Computerised or programmable systems

Definitions

  • This invention relates to a filter press and, more specifically, to an improved plate shifter which employs a weight-responsive vibrating device for bumping the individual plates during opening movement thereof to assist in dislodgement of filter cake.
  • Filter presses are well known and extensively utilized for separating solids from slurries. Such presses employ a plurality of filter plates which are held in contacting relationship between fixed and movable head members while the slurry is pumped into and through the press for collecting the solid in the form of filtrate or cake between adjacent filter plates.
  • the movable head is backed away from the plates into an open position and, in one conventional type of press, the plates are then individually and seguentially moved into an open position adjacent the movable head to permit discharge of the cake which has collected between adjacent pairs of plates.
  • plate shifting mechanisms are typically provided adjacent opposite sides of the press for permitting automatic or manual control over the plate movement and cake discharge.
  • a pair of substantially identical plate shifter mechanisms are typically provided adjacent opposite sides of the press for synchronous cooperation with handles of the individual plates, whereby the shifter mechanisms reciprocate back and forth along the press side rails so as to individually but seguentially move each plate toward the opened head for permitting cake discharge.
  • These mechanisms typically each employ a pair of movable stops or pawls, one for abutting the leading plate in the stack to prevent advancing movement of the shifter mechanism, the other for engaging the opposite side of the leading plate to move it toward the movable head when the shifter mechanism is moved in the opposite direction.
  • One example of such mechani ⁇ m is disclosed in Assignee's U.S. Patent No. 4 963 255.
  • the filter plates are joined together through a control device such as a cable or linkage so that, during opening of the press, all of the plates are substantially simultaneously moved into an open separated condition with the spacing or separation between each adjacent pair of plates being controlled by the connecting linkage.
  • All of the plates, adjacent one side thereof, are supported on an elongate tube which extends longitudinally along the press and is of square or rectangular profile. This tube is then rotated to impose a vibration or bouncing movement on the handles provided adjacent one side of the filter plates, whereby all of the plates are simultaneously vibrated on one side thereof to assist in discharge of the sticky cake.
  • the vibrating device of this '537 application has proven effective in vibrating the individual filter plates during opening movement thereof so as to assist in dislodgement of filter cake, nevertheless the vibrating or bumping of the individual plate occurs in a cyclic or repetitive manner throughout the entire return or opening movement of the plate, with each plate being treated or vibrated the same during the opening movement thereof. This thus tends to lead to an excessive number of bumping cycles in many instances since the bumping rate cannot be readily varied as the plate is moved in the opening direction. Further the overall vibrating device is almost entirely mechanical in nature, and thus the device possesses a great number of parts and assembly steps, thereby providing a greater degree of overall structural and operational complexity than desired.
  • an object of this invention to provide an improved shifter mechanism for a filter press, which shifter mechanism incorporates a vibrating mechanism for effecting bumping of individual filter plates during the separation thereof from the closed stack to assist in dislodgement of filter cake from the individual filter plates.
  • the improved vibrating mechanism of this invention as incorporated on the plate shifter mechanism, provides for increased flexibility and efficiency of operation with respect to the ability to selectively bump the individual plates, including the ability to more selectively control the number of bumping cycles for each individual plate.
  • this improved vibrating device activation thereof is responsive to the weight of the filter plate being bumped, whereby the vibrating device will be activated only upon sensing a filter plate having a weight greater than a predetermined value so as to be indicative of an undesired quantity of filter cake being adhered thereto, with subsequent bumping cycles in turn being activated in response to weight sensing so that the number of bump cycles, up to at least a predetermined maximum, will in turn be controlled by the weight of the filter plate so as to provide desired control over the bumping of each plate including the number of bumping cycles.
  • the mechanism includes a reciprocal housing which is supported for movement along the side rail of the press and, in addition to the usual pawls for stopping shifting movement in one direction and effecting opening driving of the frontmost filter plate in the opposite direction, also includes a vibrator which is mounted on the shifter housing and cooperates with the frontmost filter plate to effect raising of at least one side of the filter plate being shifted, followed by dropping thereof onto the side rail so as to impose an impact or bump thereon to assist in loosening of the filter cake adhered thereto.
  • the vibrating device includes a fluid pressure controlled actuator which engages a horizontal projection on the frontmost filter plate, such as the side handle of the filter plate, to effect vertical lifting of the filter plate, with the sudden deactivation of the actuator permitting a generally gravity-induced free fall of the filter plate back onto the press side rails.
  • the pressure of the fluid which is supplied to and controls the actuator during a weight-sensing step responds to the weight of the filter plate, and effects lifting and subsequent bumping or dropping of the plate only when the plate exceeds a predetermined weight so as to indicate the presence of excessive filter cake adhered thereto.
  • Figures 1 and 2 are diagrammatic top and side views, respectively, of a conventional filter press.
  • Figure 3 is an enlarged, fragmentary view along line 3-3 in Figure 2.
  • Figure 4 is an enlarged, fragmentary side elevational view showing the shifter mechanism associated with one side of a filter press according to the present invention, the vibrating device being removed for clarity of illustration.
  • Figure 5 is a sectional view taken generally along line 5-5 in Figure 4.
  • Figure 6 is a fragmentary side elevational view which shows the shifter mechanism with the vibrating device mounted thereon.
  • Figure 7 is a sectional view taken generally along line 7-7 in Figure 6.
  • Figure 8 is a diagrammatic view of the electronic and fluid control arrangement for the weight-sensing and vibrating system.
  • FIG. 1 and 2 there is illustrated a generally conventional filter press 10 having a pair of end supports 11 and 12 rigidly joined together by a pair of generally parallel and horizontally elongate side rails 13, which side rails are sidewardly spaced apart and cooperate with the end supports to define a generally rigid frame.
  • the filter press has a movable follower or head arrangement 14 disposed adjacent one end of the press frame and slidably supported for movement along the side rails 13.
  • This movable head 14 is slidably displaceable horizontally along the side rails toward or away from a further head 15 which is fixed to the frame adjacent the other end of the side rails.
  • a drive device 16 such as a conventional double-acting pressure cylinder, is mounted on the frame and cooperates with the movable head 14 for controlling movement thereof either toward or away from the fixed head 15.
  • a plurality of conventional filter plates 17 are suspendingly supported on and between the side rails 13.
  • the filter plates extend generally transversely between the side rails so that the plates are disposed in adjacent relationship to form a generally horizontally extending stack of plates in the longitudinal direction of the press.
  • Each filter plate 17 has support arms or handles 18 which project outwardly from opposite sides of the respective filter plate in overlapping and slidable supportive engagement with the upper edges of the side rails 13, thereby enabling the filter plates to be slidably displaced along the side rails in the longitudinal direction of the filter press.
  • the support arms or handles 18 have a width in the lengthwise direction of the press which is significantly less than the width of the respective filter plates 17, whereby adjacent handles 18 define clearance spaces of predetermined width therebetween when adjacent filter plates are in abutting engagement, substantially as illustrated by Figure 2.
  • the driving device 16 is activated to move the head 14 forwardly (leftwardly in Figures 1 and 2) ⁇ o that the stack of filter plates 17 are snugly and tightly held between the opposed heads 14 and 15.
  • One or both of these heads have suitable conduits (not shown) connected therethrough for communication with the interior of the stack of filter plates.
  • a slurry is supplied through one of the heads into the stack of filter plates, and the cleaned liquid flows outwardly through the plates and out through a conduit, whereupon the solids collect on the filters or membranes which extend across the ringlike frames of the filter plates.
  • the head 14 is moved rearwardly (rightwardly in Figures 1 and 2) into an open position substantially as illustrated by solid lines in Figure 2, and then the filter plates 17 are individually and sequentially moved rearwardly (leftwardly in Figure 2) away from the stack toward the movable head 14 to permit the solids which collect between plates to drop downwardly for deposit into a suitable collecting bin.
  • the filter plates 17 are individually and sequentially moved rearwardly (leftwardly in Figure 2) away from the stack toward the movable head 14 to permit the solids which collect between plates to drop downwardly for deposit into a suitable collecting bin.
  • the filter press 10 has a plate shifting arrangement 21 which includes a pair of plate shifter mechanism 22, one such mechanism 22 being disposed exteriorly adjacent each of the side rails 13, and a drive device 23 which connects to the pair of shifter mechanisms 22 for effecting synchronous linear back-and-forth movement of these mechanisms 22 along the side rails 13.
  • the driving device 23 includes an elongate flexible drive member 24, ⁇ pecifically a chain, which extends generally longitudinally parallel with the adjacent side rail 13 and is supportingly engaged and driven by a drive sprocket 25 which is rotatably supported adjacent one end of the press, and is engaged on a rotatable idler sprocket 26 rotatably supported adjacent the other end of the press.
  • the drive sprocket 25 is nonrotatably coupled to a drive shaft 29 ( Figure 3) which extends generally horizontally transversely of the press and is driven by a reversible drive motor 27 through a conventional torque- sensing reversing mechanism 28.
  • the drive shaft 29 extends transversely across the press frame and is provided with identical drive sprockets 25 on opposite ends thereof which engage drive chains 24 provided adjacent the opposite side rails 13 so as to permit synchronous driving of the two shifter mechanisms 22 which are disposed adjacent the opposite side rails 13.
  • the overall structure and function of the filter press 10 as described above, including the driving device 23, is conventional and well known.
  • the shifter mechanism 22 includes a carrier or housing 31 which is generally Z- shaped in cross section and includes generally vertically and horizontally extending top and bottom support plates 32 and 33 which are vertically and sidewardly spaced apart and are rigidly joined by a generally horizontally extending intermediate plate 34.
  • a plurality of support rollers (not shown) are cantilevered inwardly from the bottom plate 33 and are disposed for straddling and rolling engagement with upper and lower edges of a horizontally elongate support track 36.
  • This support track 36 is secured to a plurality of intermediate spacers 37 which are fixed to and project outwardly from the adjacent side rail 13 in longitudinally spaced relation therealong.
  • spacers 37 thus fixedly support the support track 36 in outwardly spaced relation from the adjacent side rail 13, with the track 36 being horizontally elongated longitudinally of the press so as to extend along a majority of the side rail to enable movement of the shifter mechanism 22 therealong.
  • the movement of the shifter mechanism is controlled by the drive chain 24, the elongate upper reach of which is joined to the shifter housing 31 by an intermediate connecting plate or link 38.
  • a horizontally elongated channel-shaped guide rail 39 is also fixed to and extends longitudinally along the outer side of each side rail 13. This guide rail 39 is provided for guiding the upper and lower reaches of the drive chain 24, with the upper and lower horizontally- projecting legs of this guide rail 39 respectively slidably supporting the upper and lower reaches of the drive chain as these reaches extend between the sprockets 25 and 26.
  • the shifter mechanism 22 mounts thereon a stop device 41 which coacts with the filter plates 17 to limit forward (leftward in Figures 1 and 2) movement of the shifter mechanism.
  • This stop device 41 comprises a stop member 42 which is preferably formed as an elongate pawl or lever, and is supported at one end thereof by a pivot 43 which defines a generally horizontal axis 44 which extends generally perpendicular relative to the longitudinal direction of the press.
  • This stop lever 42 has its pivot 43 supported on the top plate 32 of the shifter housing 31.
  • the stop lever or pawl 42 defines an abutment surface 45 at the free end thereof which is adapted to abuttingly contact a front side or surface of the filter plate handle 18.
  • the stop pawl 42 is normally urged into an upper position, substantially as illustrated by Figure 4, by a biasing spring 46.
  • the stop pawl 42 also has a radially projecting tab or stop 47 thereon which is positioned for abutting engagement with a stop pin 48 fixed to the housing plate 32, which stop pin and its engagement with the tab 47 function to define the upper (i.e. stopping) position of the stop pawl 42 due to the urging of the spring 46.
  • the stop pawl 42 also has the upper surface 49 thereof formed with a gradual convex curvature so as to function as a cam surface for slidable cooperation with the handles of the filter plates to permit passage of the stop pawl 42 beneath the handles 18 during the return (i.e. rightward) movement of the shifter housing.
  • the shifter mechanisms 22 also mounts thereon a plate driving device 51 which is defined primarily by a driving member 52 which is also formed as a pawl or lever, the latter being supported on the top housing plate 32 by a pivot 53, the axis 54 of which extends parallel with the axis 44 of the stop pawl 42.
  • the pivot 53 is spaced longitudinally forwardly a substantial distance from the pivot 43, whereby the stop pawl 42 and drive pawl 52 are spaced from one another in the longitudinal direction of the press, with the drive pawl 52 being position more closely adjacent the forward end of the shifter housing 31.
  • the drive pawl 52 includes a generally L-shaped arm 55 which projects upwardly from the pivot 53, and the radially outwardly projecting inner portion of this arm defines on the front face thereof an abutment surface 56 which is adapted to abuttingly contact a rear surface of the filter plate handle 18.
  • This radially outwardly projecting inner arm portion is in turn integrally joined to a circumferentially extending outer arm portion which projects in the forward direction of the press when the drive pawl 52 is in the normal raised position illustrated in Figure 4.
  • the drive pawl 52 terminates in a rounded free end 57 which in turn merges smoothly with a generally smooth and convex curved upper surface 58 of the pawl.
  • Drive pawl 52 also has a radial tab or stop 59 which is fixed thereto and projects outwardly for engagement with a cooperating stop 61 which is fixed to the housing plate 32.
  • the engagement of tab 59 against stop 61 functions to define the normal raised position of the drive pawl 52 as shown in Figure 4, and the drive pawl 52 is normally maintained in this raised position due to the biasing of a suitable spring, this being one end of the spring 46 in the illustrated embodiment, although a separate spring can be provided if desired.
  • the stop pawl 42 and drive pawl 52 when maintained in the rai ⁇ ed positions shown in Figure 4, are disposed so that the upper extremities thereof are at an elevation above the lowermost extremity of the handles 18 associated with the filter plates 17, and the upper extremities are positioned for engaging cooperation with the handles as the shifter mechanism 22 is moved relative to the filter plates 17.
  • the pump supplying the slurry into the press is shut down, the head 14 is returned to its open position, and the shifting mechanism 22 are then activated so as to individually and sequentially return the filter plates 17 from the closed position (i.e., the stack of plates positioned adjacent the head 15) into an open position adjacent the opened head 14.
  • the shifting mechanism 22 is moved toward the stack of filter plates, and when the shifter mechanism reaches the frontmost plate of the stack the rounded free end of drive pawl 52 contacts the front face of the handle 18, causing the drive pawl to pivotally swing downwardly (clockwise) into a lowered or retracted position, thereby enabling the drive pawl to pass under the handle 18.
  • the shifter mechanism continues its rightward movement, and the drive pawl 52 after passing the handle of the front plate is then spring-urged upwardly so that the free end of the pawl 52 is urged into the space or gap defined by the handles of the adjacent plates.
  • the abutment end or nose of the stop pawl 42 contacts the front face of the handle of the endmost filter plate, thereby stopping further forward (i.e., leftward) movement of the shifter mechanisms.
  • the torque-reversing drive then causes the shifter mechanisms to begin their return movement (rightward) toward the opened head 14.
  • the plate shifting arrangement 21 also incorporates a system or means for sensing the weight and for bumping the endmost plate of the stack after it has been initially separated from the stack by the driving pawls 52, with the weight sensing and bumping of the endmost plate preferably occurring during the return movement of the shifter mechanisms 22 as the endmost plate 17 is being driven thereby.
  • a device 71 for weight sensing and bumping of the endmost filer plate during the return movement thereof includes a pressure fluid actuator 72 which, in the illustrated embodiment, comprises a generally conventional double- acting pneumatic cylinder having a housing 73 provided with a piston 74 ( Figure 8) slidably disposed therein, the latter having a piston rod 75 fixed thereto and slidably projecting outwardly through the upper end of the housing 73.
  • the housing 73 is provided with trunnions 76 adjacent the lower end thereof, which trunnions define a substantially horizontally extending pivot axis 77 which extends in generally parallel relation with the longitudinal direction of the press.
  • These trunnions 76 are rotatably supported on a pair of generally parallel and vertically projecting side frame plates 78 which are fixed to the lower plate 33 of the shifter housing 31.
  • the side frame plates 78 have generally parallel upper portions 79 which project upwardly and are spaced apart in the longitudinal direction of the press, with these upper portions 79 having identical and longitudinally-aligned elongate cam slots 81 formed therein.
  • Each cam slot 81 includes an elongate upper slot portion 82 which projects upwardly in generally vertical relation, and the lower end of this upper slot portion 82 merges with and constitutes a continuous extension of the upper end of a lower slot portion 83.
  • This lower slot portion 83 angles outwardly (i.e., sidewardly away from the press side rail 13) and downwardly relative to the upper slot portion 82.
  • the upper or free end of the piston rod 75 has a lifting or engaging member 85 fixed thereto, which member has a platelike configuration and projects transversely relative to the piston rod so that a flat upper surface 86 of the lifting member 85 extends generally in perpendicular relationship to the longitudinal axis 87 of the pres ⁇ ure cylinder.
  • This lifting member 85 projects sidewardly from the piston rod in a direction toward the adjacent side of the pres ⁇ .
  • the lifting member 85 ha ⁇ cam rollers or followers 88 mounted on opposite sides thereof, which cam rollers are movingly engaged within the cam slots 81 defined on the side frame plates 78.
  • the bumping device 71 is normally maintained in the lowered or retracted position as illustrated by solid lines in Figures 6 and 7, in which position the lifting blade 85 is positioned downwardly and angled outwardly away from the handles 18 of the filter plates. In this position, the lifting blade 85 is also disposed outwardly away from and hence does not interfere with the pivoting movement of the driving lever 52.
  • the driving lever 52 When the bumping device 71 is activated, however, the driving lever 52 is in its raised position disposed in abutting engagement with a rear side of the handle 18, and thus as the piston rod 75 is raised upwardly, the cam followers 88 move along the lower curved cam slot 83 causing the lifting blade 85 to be initially swung inwardly for deposition directly under the lower surface of the handle 18 of the filter plate being shifted, following which the cam followers 88 then move upwardly along the upper straight cam slots 82 whereby the lifting blade 85 moves upwardly into the position indicated by dotted lines in Figure 7, thereby causing that side of the filter plate to be raised upwardly a predetermined distance above the upper edge of the side rails 13.
  • the weight-sensing and bumping system of the present invention in addition to the vibrating device 71 described above, also includes an electronic and fluid control arrangement 90, one embodiment of which is diagrammatically illustrated in Figure 8.
  • control arrangement 90 includes a fluidic and more specifically a pneumatic circuitry whereby pressurized fluid and preferably air is connected to a pres ⁇ ure ⁇ ource 93, ⁇ uch as the conventional supply of pre ⁇ urized air which i ⁇ provided in many factorie ⁇ .
  • the pressurized air is supplied from source 93 to a main supply conduit 95 through a main on-off control valve 94, and this main supply conduit 95 connects to a branch supply conduit 96 which is used for controlling and supplying pressurized air to the bump cylinder 72 associated with the shifter mechanism.
  • the supply conduit 96 is connected to a pair of branch conduits 98 and 99 through a main flow control valve 97, such as a conventional four-way valve, the latter also having a port which connects to a discharge pas ⁇ age 101 which in turn connects to a suitable reservoir or return tank 102.
  • the branch pas ⁇ age or conduit 98 connects to the lower chamber 91 as ⁇ ociated with the bump cylinder 72, and the branch pa ⁇ sage or conduit 99 connects to the upper chamber 92 of the bump cylinder 72.
  • the passage 96 also contains therein a pre ⁇ ure regulating valve 104 (such as an electric analog controlled pres ⁇ ure regulating valve) which control ⁇ the pre ⁇ ure of the fluid supplied to bump cylinder 71.
  • the filter pres ⁇ al ⁇ o include ⁇ a main controller
  • the controller 111 preferably comprising a microprocessor, which controller controls all of the functions of the press, including controlling the pres ⁇ urized fluid which i ⁇ supplied to the bump cylinder 72 for controlling both the weight- ⁇ en ⁇ ing and bumping operations thereof.
  • the controller 111 provides and receives various control signals so as to control the overall press operation including the weight-sensing and bumping operations.
  • the bump cylinder 72 also has position sensors such as magnetically-actuated reed switches Sl and S2 associated therewith for sensing the respective extended and contracted position ⁇ of the bump cylinder, whereby a control signal a or b is sent to the controller ill only when the cylinder 72 is in the respective extended or contracted position.
  • position sensors such as magnetically-actuated reed switches Sl and S2 associated therewith for sensing the respective extended and contracted position ⁇ of the bump cylinder, whereby a control signal a or b is sent to the controller ill only when the cylinder 72 is in the respective extended or contracted position.
  • the controller 111 also has an internal timer T associated therewith which is provided so as to provide for a predetermined time interval Tl following activation of a weight-sensing cycle, as explained in greater detail hereinafter.
  • the controller al ⁇ o ha ⁇ a keypad (not ⁇ hown) associated therewith and being manually actuatable for permitting various functions to be manually selected and controlled.
  • the keypad enables program selection for permitting operation of the press without either a bumping or a weight-sen ⁇ ing mode, or for selecting solely the vibrating or bumping mode, or for selecting both the weight-sensing and bumping modes.
  • the keypad also enables the number of sequential bump cycles to be selected during return movement of the filter plate, as well as selecting the number of weight- sen ⁇ ing cycles followed by the ⁇ elected number of bumping cycle ⁇ after each weight-sensing cycle.
  • the output pres ⁇ ure from the valve 104 can also be adjusted.
  • the stoppage of the shifter housing ⁇ by the stop levers 42 causes the drive motor 27 to reverse direction and initiate movement of the shifter mechanisms in a rearward (rightward) direction, and during the initial rearward (rightward) movement the driving lever 52 wedgedly reacts between the handles of the endmost and next-adjacent filter plates so as to effectively pry the endmost filter plate a small distance away from the adjacent plate, thereby effectively breaking any adhesion or suction between the two plates.
  • the machine controller 111 has been selected to merely sequentially open the plate ⁇ without activating either (1) a bump cycle or (2) a weight-sensing and bumping cycle, such as due to the filter cake being of a nonsticky type, then the plates will be individually and sequentially moved into an open position adjacent the head 14, and the filtrate will be permitted to fall by gravity downwardly into a collecting bin as the plates are individually opened and moved.
  • each filter plate during the opening movement thereof will be sequentially and individually bumped the predetermined number of cycle ⁇ N which has been selected.
  • the number of bumping cycles will occur sequentially as the plate is being moved toward its open position adjacent the open head 14.
  • the controller 111 supplies a control signal r to the valve 97 causing it to shift into a position whereby the pressure from the passage 96 is supplied to passage 98 and thence into the bottom chamber 91 of the bumping cylinder 72.
  • the valve 97 connects the other passage 99, and hence the upper chamber 92, to the discharge or exhaust passage 101.
  • the uppermost position sen ⁇ ing ⁇ witch S2 sense the presence of the piston rod and transmit a signal a back to the controller 111, whereupon the controller transmit ⁇ a further signal to the valve 97 causing it to reversely shift, thereby connecting passage 98 to the exhaust 101 and ⁇ imultaneou ⁇ ly connecting the passage 99 to the supply pres ⁇ ure pa ⁇ sage 96.
  • the supply pres ⁇ ure is thus supplied to the upper chambers 92, causing the bump cylinder 72 to be rapidly driven downwardly into its lowermost position, which is ⁇ en ⁇ ed by the po ⁇ ition sensor S2 which then transmits a signal b to the controller 111 to indicate that the bump cylinder 72 has returned to its initial or lowermost position.
  • the previously raised filter plate 17 effectively free falls downwardly until the handle 18 abuts the side rail 13, thereby providing a significant bumping or impacting of the filter plate which tends to as ⁇ i ⁇ t in di ⁇ lodging the ⁇ ticky filter cake adhered thereto.
  • controller 111 ha ⁇ been programmed to provide a number N of sequential bumping cycles where N is greater than 1, than the above bumping cycle will be sequentially repeated until the preprogrammed number of bumping cycles N has been completed. All of these bumping cycles will occur a ⁇ the filter plate i ⁇ being drivingly moved rearwardly (rightwardly) toward the open head 14.
  • controller 111 has been preprogrammed to provide for both weight-sen ⁇ ing and bumping (if nece ⁇ ary) of the individual filter plate ⁇ during the return or opening movement thereof.
  • the number N w of ⁇ equential weight-sensing cycles, as well as the number N b of sequential bump cycles following each weight-sensing cycle will be adjustably preprogrammed in the controller 111.
  • the controller 111 supplie ⁇ a ⁇ ignal s to the pres ⁇ ure regulator 104, and ⁇ ubstantially simultaneously supplies a signal r to the control valve 97 to connect both pas ⁇ ages 98 and 99 to the ⁇ upply pre ⁇ ure pa ⁇ age 96.
  • the regulated pressure in line 96 is thus simultaneously supplied through passages 98 and 99 to the pressure cylinder chambers 91 and 92.
  • the force differential will be of sufficient magnitude to move the piston rod 75 upwardly to effect lifting of the filter plate 17 and activation of position switch Sl prior to timing out of a predetermined time interval Tl, the latter having been preprogrammed in the timer T of the controller 111, with this time interval Tl being initiated at the same time the controller activates the weight- ⁇ en ⁇ ing cycle. This thus indicates that the plate is clean and does not require bumping.
  • the controller switches valve 97 so that pre ⁇ sure is supplied only to the upper chamber 92, thereby drivingly retracting the bump cylinder 72 and thus providing a single bump cycle for the filter plate. Thereafter the filter plate is moved rearwardly by the ⁇ hifter mechani ⁇ m ⁇ until reaching its home or open position.
  • controller 111 immediately transmits a signal which switche ⁇ valve 97 so that pas ⁇ age 98 remain ⁇ connected to pa ⁇ age 96, but pa ⁇ sage 99 is connected to exhaust pas ⁇ age 101. Thi ⁇ results in a full lifting force being applied to the bump cylinder 72.
  • the second weight-sen ⁇ ing cycle will then be initiated.
  • the ⁇ econd weight- ⁇ en ⁇ ing cycle will follow the same pattern as the first cycle described above, and will also include the selected number of bump cycles N..
  • the bump cylinder 72 is able to lift the plate and fully extend so as to activate upper position sensor Sl prior to timing out of the time Tl, then this indicates that the plate is now clean, and the bump cylinders will be returned to their initial positions and no further weight-sensing or bump cycles will be carried out.
  • the number of sequential weight-sensing cycles, and the number of sequential bumping cycles a ⁇ ociated with each weight- sensing cycle can be preprogrammed to provide for optimum performance based upon the properties of the filter cake and the stickine ⁇ thereof to the filter plates.
  • this invention enables the weight-sensing and bumping cycles to be terminated prior to the preprogrammed number if a clean plate is sen ⁇ ed.
  • the weight of the cake which adheres to the filter plate is approximately equal to the weight of the filter plate, this permits significant discrimination to take place between an empty or clean plate, and a plate having an undesired quantity of cake adhered thereto.
  • the pressure regulator 104 to be suitably adjusted so that the force differential as applied to the extension of the lifting cylinder during the weight-sensing cycle can be adjusted so as to provide a fairly high degree of accuracy with respect to sensing a filer plate having the desired degree of cleanliness (i.e., the lack of any significant quantity of filter cake adhered thereto) .
  • the weight-sensing and vibrating arrangement of this invention can be provided on either or both shifter mechani ⁇ ms 22, and can be individually or simultaneously activated.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Un mécanisme de déplacement (22) pour une presse à filtre est pourvu d'un mécanisme de vibration (71) qui effectue le cognement de plaques individuelles de filtration (17) pendant leur séparation de la pile fermée afin de faciliter le délogement du gâteau de filtre et l'éjecter hors des plaques de filtration. Le dispositif de vibration peut faire vibrer ou cogner sélectivement les plaques de filtre individuelles en fonction du poids de la plaque de filtre sur laquelle il agit, de sorte que ce dispositif de vibration n'est activé que lors d'une détection d'une plaque de filtre dont le poids est supérieur à une valeur prédéterminée signifiant qu'une quantité indésirée trop importante du gâteau de filtre est collée à cette plaque.
EP96932266A 1995-10-20 1996-09-13 Presse a filtres avec cognement sensible au poids des plaques de filtration Expired - Lifetime EP0862489B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/546,107 US5674384A (en) 1995-10-20 1995-10-20 Filter press with weight-responsive bumping of filter plates
PCT/US1996/014990 WO1997014492A1 (fr) 1995-10-20 1996-09-13 Presse a filtres avec cognement sensible au poids des plaques de filtration
US546107 2000-04-10

Publications (3)

Publication Number Publication Date
EP0862489A1 true EP0862489A1 (fr) 1998-09-09
EP0862489A4 EP0862489A4 (fr) 1999-07-28
EP0862489B1 EP0862489B1 (fr) 2001-12-05

Family

ID=24178901

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96932266A Expired - Lifetime EP0862489B1 (fr) 1995-10-20 1996-09-13 Presse a filtres avec cognement sensible au poids des plaques de filtration

Country Status (7)

Country Link
US (1) US5674384A (fr)
EP (1) EP0862489B1 (fr)
JP (1) JPH11513609A (fr)
KR (1) KR19990066951A (fr)
AT (1) ATE209948T1 (fr)
DE (1) DE69617727T2 (fr)
WO (1) WO1997014492A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5855778A (en) * 1997-08-07 1999-01-05 William R. Perrin Ontario Ltd. Filter press
DE19850602C1 (de) * 1998-11-03 2000-08-17 Erich Netzsch Gmbh & Co Kg Verfahren zum Entleeren von Filterpressen
FR2893860A1 (fr) * 2005-11-28 2007-06-01 Faure Equipements Sa Dispositif de decolmatage des plateaux d'un filtre presse
CN101601942B (zh) * 2009-07-07 2011-04-13 景津压滤机集团有限公司 压滤机滤板分组振打装置
JP5592710B2 (ja) * 2010-06-17 2014-09-17 セイコーインスツル株式会社 ピッチ変換装置
KR102191378B1 (ko) * 2020-06-17 2020-12-15 서울특별시 하수슬러지의 인 회수용 필터프레스 장치 및 이를 통해 초음파를 이용한 인 회수 방법
CN112957782B (zh) * 2021-03-19 2022-05-27 桂林汇东机械设备有限公司 一种连续性压滤机及其使用方法
CN114832456B (zh) * 2022-04-28 2024-06-21 南通西田环保科技有限公司 一种含抗生素畜禽废水的智能处理设备
CN115228158A (zh) * 2022-07-22 2022-10-25 中煤西安设计工程有限责任公司 一种浓缩压滤智能控制系统及控制方法
CN115040919B (zh) * 2022-08-16 2022-10-25 南通海隆磁业有限公司 一种磁性材料生产用废水过滤装置

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4209404A (en) * 1975-05-22 1980-06-24 Ngk Insulators, Ltd. Filter press
DE2923967A1 (de) * 1979-06-13 1980-12-18 Netzsch Maschinenfabrik Filterpresse
US4446020A (en) * 1981-12-28 1984-05-01 Kurita Machinery Manufacturing Company Limited Filter press
JPS59209623A (ja) * 1983-05-11 1984-11-28 Kurita Mach Mfg Co Ltd フイルタプレスの濾板送り装置
DE3520571A1 (de) * 1985-06-07 1986-12-11 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 8672 Selb Filterpresse mit spreizvorrichtung
DE3640171A1 (de) * 1986-11-25 1988-05-26 Michael Steinroetter Verfahren und vorrichtung zum selbsttaetigen entleeren von filterpressen
US4806239A (en) * 1986-11-28 1989-02-21 Envirotech Corporation Apparatus for shifting filter plates in a filter press
SE462832B (sv) * 1988-01-08 1990-09-10 Sala International Ab Foerfarande och anordning vid pressfilter
US4963255A (en) * 1989-06-02 1990-10-16 Jwi, Inc. Plate shifter for filter press
DE4115105A1 (de) * 1991-05-08 1992-11-12 Netzsch Erich Holding Verschiebevorrichtung fuer filterplatten an einer filterpresse
AU628750B1 (en) * 1991-06-21 1992-09-17 Ishigaki Company Limited A filter press with cake removing devices
US5328617A (en) * 1992-09-28 1994-07-12 Jwi, Inc. Air-assist discharge of filter press cake

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
No further relevant documents disclosed *
See also references of WO9714492A1 *

Also Published As

Publication number Publication date
WO1997014492A1 (fr) 1997-04-24
KR19990066951A (ko) 1999-08-16
ATE209948T1 (de) 2001-12-15
JPH11513609A (ja) 1999-11-24
DE69617727D1 (de) 2002-01-17
DE69617727T2 (de) 2002-08-08
US5674384A (en) 1997-10-07
EP0862489A4 (fr) 1999-07-28
EP0862489B1 (fr) 2001-12-05

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